The nucleon axial charge from lattice QCD with controlled errors

S. Capitani, M. Della Morte, G. von Hippel, B. Jäger, A. Jüttner, B. Knippschild, H. B. Meyer, H. Wittig

Research output: Contribution to journalJournal articleResearchpeer-review


We report on our calculation of the nucleon axial charge gA in QCD with two flavours of dynamical quarks. A detailed investigation of systematic errors is performed, with a particular focus on contributions from excited states to three-point correlation functions. The use of summed operator insertions allows for a much better control over such contamination. After performing a chiral extrapolation to the physical pion mass, we find gA=1.223 +/- 0.063 (stat) +0.035 -0.060 (syst), in good agreement with the experimental value.
Original languageEnglish
Article number074502
JournalPhysical Review D
Publication statusPublished - 1. May 2012
Externally publishedYes


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